Reading about the SSL renegotiation problem CVE-2009-3555 one knows that servers supporting old type of renegotiation are vulnerable to data injection. We also have tools to test them (openssl s_client and Qualsys SSL labs).

But what's the situation with clients? After checking the https://ssltls.de site using few browsers, it would seem that the only two browsers that have fixed this problem are Firefox (since 3.5.9 and 3.6.2) and Opera (since 11.00 or 10.50?).

Browsers that are still vulnerable according to the site are:

  • Chrome 9.0.597.16
  • Chrome 12.0.742.124 (!)
  • Chrome 13.0.782.56 beta
  • Chrome 14.0.825.0 dev
  • Internet Explorer 9 (!)
  • Konqueror 4.6.3

Is this test reliable? Or is the situation really this grim?

Edit: Is there a way to use openssl s_server to test client's vulnerability?

  • Safari 5.1 on Mac OS Lion is still vulnerable.
    – Wei Hu
    Aug 5, 2011 at 18:28
  • @Wei Hu: According to the site ssltls.de, or did Apple still not applied a quick hack (disable renegotiation)? Aug 6, 2011 at 13:34
  • According the cite you linked to.
    – Wei Hu
    Aug 8, 2011 at 8:15

1 Answer 1


All current versions of the major browsers (IE/FF/Chrome) are actually patched with the fix for secure renegotiation.

The ssltls.de site has some problems it seems, as I went to it using different browsers, different network connections, and I got inconsistent results. Wireshark shows the browsers sending the extension and server replying to it, so it seems the test can be improved to better detect the extension.

  • 1
    Now that is interesting!
    – Rory Alsop
    Jul 21, 2011 at 17:23
  • For one, the use of different port numbers was blocked by the proxy on one of the connections I used. That immediately flaged all browsers as vulnerable.
    – Nasko
    Jul 21, 2011 at 22:01

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